feat(admin): dashboard home, telemetry section, enrollment ops screen

- mission-control dashboard: now strip, tournament quick actions, usage
  sparklines, error feed, live activity, tools list
- /admin/telemetry with functions/events/errors/players/usage child routes,
  hand-rolled svg chart primitives, decomposed activities table
- error browser with grouping and mark-resolved
- consolidated per-tournament enrollment screen; hub simplified with
  run tournament promoted
- /admin/activities redirects to /admin/telemetry/functions

src/app/routes/_authed/admin/telemetry/errors.tsx

@@ -0,0 +1,27 @@
+import { createFileRoute } from "@tanstack/react-router";
+import { Suspense } from "react";
+import { prefetchServerQuery } from "@/lib/tanstack-query/utils/prefetch";
+import { telemetryQueries, lastNDays, ErrorBrowser } from "@/features/telemetry";
+import { ListSkeleton } from "@/components/skeletons";
+
+const errorGroupParams = () => ({ ...lastNDays(30), includeResolved: false });
+
+export const Route = createFileRoute("/_authed/admin/telemetry/errors")({
+  component: ErrorsTab,
+  beforeLoad: ({ context }) => {
+    prefetchServerQuery(context.queryClient, telemetryQueries.errorGroups(errorGroupParams()));
+  },
+  loader: () => ({
+    withPadding: false,
+    fullWidth: true,
+    refresh: [telemetryQueries.errorGroups(errorGroupParams()).queryKey],
+  }),
+});
+
+function ErrorsTab() {
+  return (
+    <Suspense fallback={<ListSkeleton rows={6} withSubtitle />}>
+      <ErrorBrowser />
+    </Suspense>
+  );
+}